JPH07109396B2 - Inspection jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an inspection jig used for inspecting a load capacity of a material testing machine.

B. Conventional technology For example, to check the load capacity of a fatigue tester, that is, to check whether or not it has the ability to load a test piece at a predetermined frequency while applying a predetermined load to generate a predetermined displacement (amplitude). As the inspection jig, there is known one having a structure shown in FIG.

The inside of the inspection jig body 1 shown in FIG. 6 is hollowed into a flat elliptical shape in the width direction, and the upper surface and the lower surface of the inspection jig body 1 located in the middle of this hollow portion 2 have The shaft portions 3 and 4 gripped by the grips are screwed together.

The inspection jig with such a structure is created separately for each load and displacement test condition applied to it, and when this is set in the fatigue tester and a predetermined load is statically applied, the desired displacement First, the load meter and stroke meter of the tester are used to detect whether or not this occurs. If the desired displacement is obtained for a given load, the load actuator is actually driven at a given frequency to inspect whether a vibration test at a given frequency with such load-displacement as maximum load-maximum displacement is possible. To do.

C. Problems to be Solved by the Invention However, in the conventional inspection jig as described above, another inspection jig is required every time the test condition changes, and the number of inspection jigs increases, and the inspection machine When the power supply frequency in the region where the is used becomes 50 Hz or 60 Hz, the discharge capacity of the hydraulic pump that supplies the pressure oil to the load actuator fluctuates, and the capacity of the fatigue tester also changes. Each tool is required, which further increases the number of inspection jigs.

Further, the bending amount (displacement) of the inspection jig with respect to the specified load is obtained by calculation, and each inspection jig is manufactured so that the obtained bending amount is obtained. However, even when the inspection jig manufactured according to the calculation is set in the tester and used, a slight error usually occurs between the actually detected deflection amount and the calculated value.

For example, when a load of 5 tons is applied, a bending amount of 0.5 mm is required, but only a bending amount of 0.4 mm may be detected. In this case, in the conventional inspection jig body 1 shown in FIG. 6, the side surface of the hollow portion is cut to correct the error in the bending amount.

However, such a conventional method has a problem that the correction is troublesome and the work is complicated.

An object of the present invention is to provide an inspection jig that can cope with changes in test conditions and can easily correct the deflection.

D. Means for Solving the Problem The present invention will be described with reference to FIG. 1 which is an embodiment, and the present invention will be described with reference to connection parts 17 and
A pair of opposing beam members 11, 12 each having 8 and a pair of coupling members 13 respectively coupling between the opposite ends of each beam member 11, 12 are provided, at least one of both coupling members 13 It is movable so that the span length between both coupling members can be varied, thereby achieving the above object.

E. Action The span length can be changed by moving at least one connecting member. Therefore, even if the loads input from the connecting portions 17 and 18 are the same, the bending moments generated in both coupling members 13 change, and the bending of the beam members 11 and 12 can be adjusted.

It should be noted that, in the above-mentioned items D and E for explaining the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand, but the present invention is not limited to the embodiments.

F. Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show the first embodiment.
The drawing is a front view of the inspection jig, and FIG. 2 is a right side view thereof.

In the figure, an inspection jig denoted by the general reference numeral 10 is a pair of columnar beam members 11 and 12 which are arranged in parallel with each other with a predetermined distance therebetween, and both beam members 11 and 12 at both ends of the beam members 11 and 12. A pair of movable coupling members 13 for coupling the connecting members 17, and connecting portions 17, which are screw-coupled to the outer circumferences of the large-diameter portions 11a, 12a formed in the intermediate portions of the beam members 11, 12 via nuts 15, 16, respectively. Composed of 18 and.

As shown in FIG. 2, through-holes 13a formed in the connecting member 13,
After inserting the beam members 11, 12 at one end side into 13b,
By tightening the portion of the slit 13c that communicates a and 13b with the bolt nut 19, both coupling members 13 are fixed between the opposite ends of the beam members 11 and 12.

In the inspection jig 10 configured in this way, if the span position between both the coupling members 13 is changed by adjusting the coupling position of the both movable coupling members 13 with respect to the beam members 11 and 12, the beam members 11 and 12 with respect to the load.
You can change the amount of deflection. That is, the bending amount corresponding to the designated load can be easily corrected.

Here, assuming that the width of the connecting member 13 shown in FIG. 1 is small and an inspection jig having a simple beam structure is configured, the width of the connecting member 14 is increased as shown in FIG. An inspection jig with a fixed beam structure can be constructed by tightening with one bolt to increase its rigidity.

Therefore, if the connecting member 13 having the simple beam structure and the connecting member 14 having the fixed beam structure are selectively used and combined with the change of the span length, even the inspection jigs having slightly different test conditions can be configured with the same member. As a result, the number of inspection jigs can be significantly reduced as compared with the conventional method.

FIG. 4 shows a second embodiment of the present invention. In this example, a movable coupling member 13A is interposed between the left and right ends of the beam members 11 and 12, and each coupling member 13A is integrally tightened by a bolt nut 21 penetrating the beam members 11 and 12 and the coupling member. Be combined with that.

Further, the position adjustment of the coupling member 13A to the beam members 11 and 12 in the arrow direction is performed by providing a plurality of bolt through holes formed in the beam members 11 and 12, or by forming elongated holes for bolt insertion. It will be possible.

Even in this embodiment, the same effect as that of the first embodiment can be obtained.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, one coupling member 13B is formed into a U-shape that is integrated with one end of the beam members 11 and 12, and the coupling member 13C that couples the other ends of the beam members 11 and 12 is positioned in the arrow direction. Make it adjustable. Further, the connecting portions 17 and 18 are positionally adjustable in the direction of the arrow, and are fixed with bolts and nuts 22.

In such an embodiment, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the above embodiment, but can be variously modified within the scope of the claims.

G. Effect of the Invention As described above, according to the present invention, since at least one coupling member is movable and the span length between both coupling members is variable, it is easy to correct the deflection for a predetermined load. In addition, there is an effect that the number of inspection jigs for the test condition can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
The right side view of the drawing, FIGS. 3 to 5 are schematic views showing another embodiment of the present invention, and FIG. 6 is an external view of a conventional inspection jig. 10: Inspection jig, 11, 12: Beam members 13, 13A, 13C, 14: Movable coupling member 13B: Immovable coupling member, 17, 18: Connection part

Claims (1)

[Claims] 1. A pair of opposing beam members each having a coupling portion coupled to a load shaft of a testing machine, and a coupling member coupling between opposite end portions of each beam member. An inspection jig characterized in that at least one of the coupling members is made movable so that a span length between both coupling members can be varied.